In PostgreSQL, what does VACUUM ANALYZE do and why is it necessary?

Advanced SQL Developer Hard

Advanced SQL Developer — Hard

In PostgreSQL, what does VACUUM ANALYZE do and why is it necessary?

Key points

  • VACUUM reclaims storage from dead tuples
  • ANALYZE updates query planner statistics
  • VACUUM does not rebuild indexes or compress table pages
  • ANALYZE does not remove NULL values or check for constraint violations

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